Display panel or portion thereof with a graphical user interface



The FIGURE is a front view of a display panel or portion thereof with a graphical user interface showing a first design.

The subject matter of the present disclosure includes graphical user interface components present. The broken line statement depicting a display panel or portion thereof form no part of the claimed design. 

CLAIM The ornamental design for display panel or portion thereof with a graphical user interface, as shown and described. 